html {
    font-family: Arial, sans-serif;
    background-color: #FFF;
    background-image: url('/cos1.jpg');  
    background-repeat: no-repeat;  
    background-size: cover; 
    background-attachment: fixed; 
    margin: 20px;
}
h1 {
    color: #333;
}
table {
    width: 100%;
    border-collapse: collapse;
    background-color: #fff;
}
th, td {
    padding: 8px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}
th {
    background-color: #4CAF50;
    color: white;
}
a {
    text-decoration: none;
    color: #0066cc;
}
a:hover {
    text-decoration: underline;
}